The first case in the U.S. of a more severe strain of mpox was reported in San Mateo County, the California Department of Public Health said.

Health officials say they have confirmed the first U.S. case of a new form of mpox that was first seen in eastern Congo. Authorities said Saturday

There is no evidence that the strain is spreading in California or the U.S., and the risk of contracting Clade I mpox in the U.S. remains low.